Who Is Kwak Noh-jung and How the SK Hynix CEO Bet Everything on HBM

Kwak Noh-jung spent 29 years inside the same company before he ever ran it, and on Friday July 10, 2026 he took it public in the United States for $26.5 billion, the largest first-time sale of an instrument in the US by a foreign company. Three trading days later the same stock printed the worst single session in SK Hynix history, falling 15.4% in Seoul and dragging the entire Kospi down roughly 9% with it.

That whipsaw is the story of the man. Kwak is the engineer who pointed a memory company that had survived decades of brutal commodity cycles at one product, high-bandwidth memory, and then watched that product turn into the most valuable component in the AI buildout. The market is now asking the only question that matters. Has the HBM earnings cycle already peaked.

- Name and age: Kwak Noh-jung, born November 6, 1965

- Role: President and CEO of SK Hynix since March 2022, leading 48,000+ employees

- FY2025 operating profit: 47 trillion won, about $31 billion, roughly double 2024

- Q1 2026 revenue: 52.58 trillion won, a company record

- Nasdaq debut, July 10, 2026: $26.5 billion ADR raise, closed up 13.3% at $168.85

- Seoul, Monday July 13, 2026: shares fell 15.4%, the largest one-day drop in company history

Here is who Kwak actually is, how the HBM bet was made, and what those 72 hours between the record raise and the record crash tell you about AI memory pricing right now.

Who Is Kwak Noh-jung

Kwak took his BS, MS and PhD in Materials Engineering at Korea University, then joined Hyundai Electronics, the company that would later become SK Hynix. He never left, so his entire professional life has been spent inside one memory maker, through the mergers, the crashes, and now the AI boom.

His climb was the unglamorous kind. He started as a researcher in the Process Technology Division, the group that works out how to actually build the chips the designers draw. From 2019 to 2021 he served as EVP and Head of Manufacturing Technology, then took over Safety, Development and Manufacturing, before being named President and CEO in March 2022, succeeding Lee Seok-hee.

Inside the company he is described as a "quiet achiever," and the label fits. He is not a stage performer like some of his peers in the AI supply chain, and for the counterexample look at our profile of Broadcom CEO Hock Tan, who runs a very different playbook. Kwak runs SK Hynix on three stated principles, Trust, Innovation and Growth, and he has spent most of his tenure letting the manufacturing yields do the arguing for him.

The HBM Bet That Rewired the Company

High-bandwidth memory is DRAM stacked vertically and wired directly into the processor package. Think of standard memory as a single road carrying data to the chip, and HBM as a stack of roads layered on top of each other, right next to the destination. For AI training and inference, where the bottleneck is almost never raw compute but how fast data reaches the compute, that geometry is the whole ballgame.

Kwak pushed the company to build for that bottleneck before the market had priced it, and the result is the sharpest earnings swing in SK Hynix history. FY2025 operating profit came in at 47 trillion won, roughly $31 billion, about double the 2024 figure, and Q1 2026 revenue hit a record 52.58 trillion won. HBM supply is reportedly sold out on an annual basis, which is not a phrase the memory industry has been able to use in most of its existence.

Kwak has been unusually blunt about what he thinks he is holding. "HBM now stands at the heart of the AI revolution," he said, and the line that best captures the whole strategy is even shorter. "SK hynix will be wherever AI is."

That is a bet, stated plainly, and it explains why every AI-memory print now moves the entire complex, from Micron to Samsung.

Why NVIDIA Made SK Hynix Its Top Memory Supplier

Kwak confirms what the supply chain already assumed, that SK Hynix is NVIDIA's top memory supplier. NVIDIA's new Vera CPU uses SK Hynix memory, and the company has broken into NVIDIA's GDDR7 graphics DRAM, a socket it did not previously own. Jensen Huang met Kwak and SK Group Chairman Chey Tae-won in Seoul to expand the partnership, which is not a meeting you take about a supplier you plan to second-source away from.

The dependency runs both ways, and that is the part traders underweight. NVIDIA cannot ship accelerators it cannot feed with memory, which is why NVDA at $203.68 and down 2.26% on Monday was no coincidence. Memory is no longer the boring part of the AI trade. It is the constraint.

The Nasdaq Listing and the Crash Three Days Later

The ADR offering on the Nasdaq Global Select Market was the crowning move of Kwak's tenure. It was oversubscribed, the books closed early, and the debut finished up 13.3% at $168.85. Then the Korean line broke.

The bleed was not contained to semiconductors. Bitcoin sat at $62,470 as risk assets repriced together, which is the tell that Monday was a positioning event and not a memory-specific accident.

What Actually Triggered the Selloff

Korea Investment & Securities cut its estimates, and that was the match. The broker now projects Q2 2026 operating profit of 60.4 trillion won against a 65 trillion won consensus, roughly 8% below the street, and it trimmed its 2026 and 2027 numbers by 9% and 11%.

Read that carefully, because the market did not. Those are projections from one broker, not a reported result from the company. SK Hynix has not missed anything. A single sell-side revision landing on a stock that had gone vertical into a record listing found a market with no cushion under it, and the profit-taking did the rest.

The third ingredient was mechanical. Nobody was sure how the fresh ADR should price against the existing Korean line, and that confusion widened the moves in both directions. Morgan Stanley called the selloff a **"mid-cycle reset,"**not a peak, which is the more defensible read of a company whose HBM is sold out for the year.

Frequently Asked Questions

Who is the CEO of SK Hynix?

Kwak Noh-jung, born November 6, 1965, has been President and CEO since March 2022, when he succeeded Lee Seok-hee. He holds a PhD in Materials Engineering from Korea University and spent 29 years inside the company, starting at its predecessor Hyundai Electronics.

Why did SK Hynix stock drop 15.4%?

Korea Investment & Securities cut its forecasts, projecting Q2 2026 operating profit about 8% under consensus, and that landed on a stock that had just run into a record Nasdaq listing. It was a projection plus profit-taking, not a reported earnings miss.

Is SK Hynix NVIDIA's main memory supplier?

Yes, and the relationship keeps widening rather than narrowing. Kwak has confirmed SK Hynix is NVIDIA's top memory supplier, its memory sits inside NVIDIA's new Vera CPU, and it has now won a place in NVIDIA's GDDR7 graphics DRAM as well.

Has AI memory demand peaked in 2026?

Kwak does not think so, and his own guidance is the strongest argument against the peak call. He has warned that "next year will be the worst year in the industry's history from the supply perspective," with demand outrunning capacity "even beyond 2030," and HBM being sold out annually supports him more than one sell-side cut does.

The Bottom Line

Kwak's problem from here is that both stories are true at once. HBM is sold out and the AI buildout has not slowed, and yet one broker's projection erased a fifth of the company's market value in a single session because the market is openly pricing the chance that AI memory earnings have already peaked. The number to watch is the actual Q2 2026 print against that 60.4 trillion won projection. Come in at or above the 65 trillion won consensus and Monday reads exactly as Morgan Stanley framed it, a mid-cycle reset in a stock that got ahead of itself. Come in near the cut, and the peak-earnings crowd owns the narrative for the rest of the year. Kwak spent 29 years learning to build memory nobody else could build, and he now has one quarter to prove the cycle is not what it looks like. Chip stocks like ARM will trade off his answer with him.

This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency trading involves substantial risk. Always conduct your own research before making trading decisions.